Flight O'Hare International Airport departs from Chicago O'Hare International Airport at 16:35 and arrives at Madrid Adolfo Suárez Madrid–Barajas Airport at 07:50.
The flighttime is about 8h 15m. The distance travelled ("as the bird flies"): 9378 Km. So the average speed is roughly 1137 Km.
There is an 7 hour time difference between Chicago and Madrid